For BankNifty, 38% retracement till 17800-900 ( of the entire upmove from 13400 to 20575) is pending in this leg of correction, currently hanging in between. 200 SMA is also around 17800. So 17800-17900 is likely to be touched, breaking below recent swing low of 18150-200, trap all the bears & move up sharply from there. :-)